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Dilatancy of a sample of dense sand in simple shear. The phenomenon of dilatancy can be observed in a drained simple shear test on a sample of dense sand. In the initial stage of deformation, the volumetric strain decreases as the shear strain increases. But as the stress approaches its peak value, the volumetric strain starts to increase.
Sand that is completely soaked with water also behaves as a dilatant material — this is the reason why when walking on wet sand, a dry area appears directly underfoot. Rheopecty is a similar property in which viscosity increases with cumulative stress or agitation over time. The opposite of a dilatant material is a pseudoplastic.
Navajo sandpainting, photogravure by Edward S. Curtis, 1907, Library of Congress. In the sandpainting of southwestern Native Americans (the most famous of which are the Navajo [known as the Diné]), the Medicine Man (or Hatałii) paints loosely upon the ground of a hogan, where the ceremony takes place, or on a buckskin or cloth tarpaulin, by letting the coloured sands flow through his fingers ...
Dry quicksand is loose sand whose bulk density is reduced by blowing air through it and which yields easily to weight or pressure. It acts similarly to normal quicksand, but it does not contain any water and does not operate on the same principle. Dry quicksand can also be a resulting phenomenon of contractive dilatancy.
Balmoral in Alum Bay Sand, by M Carpenter Georgian sand painting by Benjamin Zobel, c. 1800 Victorian sand picture of Steephill Castle by Edwin Dore. Marmotinto is the art of creating pictures using coloured sand or marble dust and otherwise known as sand painting.
Since the traditional art of sand drawing is so precisely geometrical, academic research is being led to associate the (ethno-) mathematical patterns held in this art, and correlate it with modern mathematics to get a sense of the potential scientific knowledge carried by the builders of the civilizations practicing it.
Moving Sand Art. Moving Sand Art or Sand Frame is a display in which there are multiple colors of sand in water between two sheets of glass. Unlike sand paintings, a sand glass is meant to be turned; the sand, traditionally in black and a light color, moves into new shapes with each turn. Unlike sand paintings, which are a traditional craft ...
Dilatancy may refer to: Dilatancy (granular material) : an increase in volume under shear Dilatancy (viscous material) : the solidification of viscous fluids under pressure